fix(package): update express-session to version 1.17.1

Closes #132

Author: greenkeeper[bot]

package.json

@@ -12,7 +12,7 @@
     "cors": "2.8.5",
     "excel4node": "1.7.0",
     "express": "4.17.1",
-    "express-session": "1.16.2",
+    "express-session": "1.17.1",
     "firebase-admin": "8.4.0",
     "mocha": "6.0.0",
     "moesif-express": "2.9.7",